Date   

Re: Lucent iLAM PA's on 13cms ?

Roger Ray
 

Paul,
If it is aluminium about 2 ft, long 1.5" high, it is the same as I use on 13cm. It has an internal 48 to 28V DC-DC converter. Easily modified to give 200W+ for about 5mW in
Roger

-- In ukmicrowaves@..., "pjm" <pauljmarsh@...> wrote:

Evening all,

Does anyone on the list know about Lucent iLAM PA's ? They seem to be designed for operation at 2.1GHz for CDMA cellular networks - will they move to 2.3GHz ? The finals in the PA are a pair of Internally matches 125Watt power mosfets, MRF21125's.

I'm thinking the PA is fairly narrow band, and of course optimised for 2.1GHz, however if its possible to move it to 13cms it might make a nice PA for terrestrial use.

Any pointers would be appreciated - I've had a dig about on t'internet but there is not much around...

thanks and regards,

Paul M0EYT.


Lucent iLAM PA's on 13cms ?

pjm <pauljmarsh@...>
 

Evening all,

Does anyone on the list know about Lucent iLAM PA's ? They seem to be designed for operation at 2.1GHz for CDMA cellular networks - will they move to 2.3GHz ? The finals in the PA are a pair of Internally matches 125Watt power mosfets, MRF21125's.

I'm thinking the PA is fairly narrow band, and of course optimised for 2.1GHz, however if its possible to move it to 13cms it might make a nice PA for terrestrial use.

Any pointers would be appreciated - I've had a dig about on t'internet but there is not much around...

thanks and regards,

Paul M0EYT.


Re: 10GHz rebuild

Christopher Bartram <cbartram@...>
 

Hello Robert

I looked at the article in Scatterpoint about a different feed arrangement
that Chris GW4DGU pointed me at, but I could not figure out what the
internal dimensions were from the drawing and looking at the W1GHZ report
on the PHO feed it looks like it will be reasonably well suited to the dish
I have.
The dimensions given in that short paper are for internal surfaces, so the
tubes are 38 and 32mm id. and all of the other dimensions are measured inside
the waveguide.

I have nothing against Peter's feed design, however, the Turrin (W2IMU) method
of making a dual-mode feed using a flare does depend on getting the flare pretty
exactly right. If you can find EXACTLY the same fittings which Peter used
(serendipititously!) in his arrangement, and if your dish matches the feed all
will be well. If you make-do with non-ideal plumbing fittings, the relative
amplitude of the two modes of waveguide propagation which the flare generates
won't be the same and thus the cancellation of the currents at the metal
surfaces at the end of the horn won't be complete, and sidelobes will be
generated, reducing the efficiency of the antenna.

A lot has happened in the world of antenna design since Dick Turrin patented
his dual mode horn in about 1966. In particular the work of Skobelev and his
collaborators has led to a much simpler mode generator using a simple
waveguide step. Courtesy of one of my work clients, I've spent a lot of time
running electromagnetic simulations of dual-mode horns for 10 and 24GHz using
exactly the same software as W1GHZ (and another 3D EM analysis software suite
for which I have a licence) and I'm impressed by the relative lack of
sensitivity of the Skobelev approach to dimensional variations vis-a-vis that
of W2IMU.

Another advantage of the Skobelev work, which W1GHz covers in his 'Antenna
Book' is that the information exists to design a feedhorn which is properly
matched to the dish. I suspect that many people don't get their dish antennas
working well.

From a knowledge of the performance of my 10GHz EME system, I believe that I
have achieved an aperture efficiency of <70% using a Skobelev feed carefully
matched to the the f/D of the reflector.

When I first commissioned my antenna - using a 1.1WL aperture W2IMU horn as the
feed, the efficiency seems to have been in the region of 45%. That's an increase
in gain of about 2dB. Although not all of that has come from feed
improvements, much of the improvement came from getting the feed exactly
right. Although you can get performance of a sort by sticking whatever the
fashionable feed-of-the-day is into a dish, proper engineering can make a big
difference.

But you don't have to take my word for all of this! If you look at the work
that other members of the microwave EME community have been doing on high
performance feeds in the last few years - particularly that of RA3AQ, you'll
see the Skobelev approach used. In fact I can't, remember a new dual-mode
feedhorn design (apart from often misunderstood attempts to copy W2IMU's
design...) using a 'flare' mode generator which has been published in the last
decade!

Vy 73

Chris
GW4DGU


Re: June UKuG Low Band Contest - Review

Ray <gm4cxm@...>
 

--- In ukmicrowaves@..., "Richard Newstead" <g3cwi@...> wrote:

Hi Ray
How big are your S points?
About 3mm Richard!

;-)

73 Ray GM4CXM


Re: June UKuG Low Band Contest - Review

Richard Newstead <g3cwi@...>
 

--- In ukmicrowaves@..., "Ray" <gm4cxm@...> wrote:

I was pleased to note an approximate 2 S point difference
Hi Ray

How big are your S points?

73

Richard
G3CWI


G4BAO 23cm PA kit - waiting list update

g4bao
 

Details on g4bao.com

--
G4BAO
QRV 23,3 and 1.2cm
Beacon keeper GB3CAM/24GHz
http://www.g4bao.com


10GHz rebuild

Robert Price <g8dtf@...>
 

Hi All

My 10GHz rebuild is coming along OK. I have everything mounted in a plastic waterproof box with waterproof connectors. The box is bolted onto a 40mm satellite patio mount via a couple of sheets of 3mm aluminium plate and some U bolts, together with the dish (60cm). The way I have mounted things I will need about 8" of coax between the SMA on the box and the feed. I have acquired a short length of Sucoflex 104 for this. The remaining task is to make a new feed. The plan is to use a Dual Mode Feed based on Peter G3PHO's design, as I have the parts for this. The only difference will be that I am going to use an SMA probe direct into the 22mm pipe, rather than a WG16 transition and a WG to round transition. Time to get the blowlamp out!

I looked at the article in Scatterpoint about a different feed arrangement that Chris GW4DGU pointed me at, but I could not figure out what the internal dimensions were from the drawing and looking at the W1GHZ report on the PHO feed it looks like it will be reasonably well suited to the dish I have.

The only concern I have mechanically is that the weight of the new system has increased dramatically as the new dish is larger and heavier, and there is also the satellite patio mount and a foot square of 6mm aluminium plate. I am having some concerns now that I need to beef up the tripod pan/tilt arrangement. The current bearing for horizontal movement is the moving part off a rotating waveguide system. This is held to the top and bottom plates with 4 x 6BA bolts on each side, and it feels a little precarious given the head load. I think I had better look for a stronger bearing. I have visions of taking it out the first time and a gust of wind snapping it in half.

I am also working on the power amplifier front. I have ordered a Downeast Microwave 8W PA kit without the FET and I have found a source of TIM0910-15L in one off quantities (albeit somewhat expensive). The DEM board was designed for an NEZ1011-8A which is an identical package type to the Toshiba device. It may need some adjustments to some of the bias components though. The TIM0910-15L is rated at about 42dBm output. I will have to add a coolig fan and ducting inside the plastic box if I get as far as getting this going. Has anyone had any experience of building amplifiers for 10GHz based on this series of devices?


73

Bob

G8DTF


Tonight - Microwave Activity Night, 6/8/2009, 8:00 pm

ukmicrowaves@...
 

Reminder from:   ukmicrowaves Yahoo! Group
 
Title:   Tonight - Microwave Activity Night
 
Date:   Monday June 8, 2009
Time:   8:00 pm - 9:00 pm
Repeats:   This event repeats every week.
Notes:   Monday nights are traditionally microwave activity nights. Why not try listening around at 20:00 local time? Better still, call CQ! Consider using KST to co-ordinate activities:

http://www.on4kst.com/chat/start.php
 
Copyright © 2009  Yahoo! Inc. All Rights Reserved | Terms of Service | Privacy Policy


Re: June UKuG Low Band Contest - Review

SAM JEWELL
 

Folks,
I have commented about this on here previously and it was also mentioned by Chris, GW4DGU, at some point. Not many of us live where it is usual to receive a plane wave front from the distant station. Due to surrounding houses, trees, tropospheric path, multiple aircraft, rain,...... and even distant urban build-up,  most signals getting to our antennas have been reflected, refracted, or diffracted (probably all three) and therefore are made up of multiple rays. For this reason the quoted gain for most antenna arrays is often different to what you expect from the text books.

After many years of testing, changing arrays etc I have found that the advantage of an array (even of just two antennas) can be more than expected due to some diversity effects. The only time the 'gain' figures seem to work is in the 'near free space' situation of using a dish for EME or satellite.

Where it is possible I think that even a simple array of two shorter antennas can be better than one (very long) antenna.

I'm sure that the antenna experts can verify this oft-forgotten fact about antennas in the real world.

73 de Sam



From: Ray
To: ukmicrowaves@...
Sent: Monday, 8 June, 2009 12:00:13 PM
Subject: [ukmicrowaves] Re: June UKuG Low Band Contest - Review

--- In ukmicrowaves@..., wrote:
>
> Hi Ray et Al,
> Sorry we did not make it this time on 23cms...
> We heard a couple of bursts at 569 but then not a lot .

I decided to experiment with a dual antenna system on the Saturday to see if there was any benefit to using the main 4x44's (quoted gain 24.1 dBd) along with a single 23el Tonna (quoted gain 13.8 dBd) for the contest on Sunday. The reason being is that I find the 4x44's excruciatingly sharp and from past results when I first started on 23cm with the Tonna, somewhat improved (longer) AR results, obviously because the wider beamwidth of the Tonna was less critical in comparison to the larger array.
As the caravan mast support base was still in my loft shack since the visit of Dave G0DJA when we did some 3cm tests, it was pressed into service to support a longer pole that put the single antenna at the same approximate height as the array. 7m of Ecoflex15 was used, about 3m less than what is on the array and 8 less connectors!
A high quality manual switch was utilised for quick comparisons.
I was pleased to note an approximate 2 S point difference of the array over the single yagi on beacons GM6BIG (33km) and GB3EDN (75Km). GB3CFG (161Km) was consistently better on the array except when an aircraft passed through the path when the increase in signal was much greater on the single yagi but this was not so apparent on GB3MHL (569Km) when I found reflections to be of a reasonably similar duration but the array a clear winner on signal strength.

In conclusion I decided against running with both antennas during the contest but it was interesting to go back to seeing how a single yagi station performed again. Obviously there will be occasions when a single 23el does produce longer aircraft reflections but the extra gain of the array makes for potentially better readability on weaker signals as well as increasing the chance of more distant troposcatter contacts being made.       

73 Ray GM4CXM




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Re: 23cms observations etc

JFELL@...
 

Interesting observations Ray.

I have to say I do not like Tonnas due to the construction techniques used , which will ensure electrolytic corrosion and noise increase over time .They do more or less what it says on the tin - polar paterns supplied show in several cases considerable lobe levels and a "cogwheel" responce.

I have made antennas using several design rules , including multiple G3JVL Quad Loop Yagis , NBS and DL6WU .
There are + and - points for all but I have found from many years of use that the DL6WU double optimised logrithmic arrangement is the overall best case in terms of forward lobe shape,controlled side lobes and very importantly when you make multiple stacked and bayed layouts , they produce the claimed performance every time , from an 11 el , 50ft boom at 50MHz , which was used this year to win the first 50MHz contest , upto 60 el single Yagis for 2.3GHz .The 144 and 1296MHz ones go well also......

The G(M)3SEK software is good to use and allows predictive examination before cutting metalwork.Yorkshiremen are as careful with their money as GM's.....

It would be worthwhile you building a bayed array for aircraft scatter work - say 4 yagis on a single horizontal boom.Ideally with elevation remote control - height agl is not too critical and at 23cms the weight is reasonable so even a standard azimuth rotator can be used for the EL and makes for rapid traverse upwards when needed .

I use elevation a lot for 5.7and 10GHz and when rain scatter is about have had wide area coverage(250km+) at times from almost virtical dish pointing .It also allows system performance to be monitored by Sun noise measurement on an SDR .

If you have a sked partner with similar system it is great fun to probe under thses conditions and find there are T9 signals available when lower angle scattering is very Aroral in nature .I love Scotland's geography and have been there many times so I can appreciate the problems you have getting over the mountains - this should help on microwave bands ...

Where I live in Dorset is under the East/West flightpath and the amount of 23cms reflections from traffic from Heathrowe is very immpressive on screen using a single 39 el Yagi - split doppler shifted traces from GB3MHL at 200km every few mins is normal , which supports your observations of the viability of Ar assisted working.I need to improve the Ms style operation though.....

Best 73
John
G0API
I080XS


Sampler for my HP 5342a

pa7jb2003 <pa7jb@...>
 

Hello, I am looking for this sampler (harmonic mixer) HP pn 5088-7022 or 5088-7522 or what mixer i can use as spare. Thank you.



73 John PA7JB


Re: June UKuG Low Band Contest - Review

Ray <gm4cxm@...>
 

--- In ukmicrowaves@..., <JFELL@...> wrote:

Hi Ray et Al,
Sorry we did not make it this time on 23cms...
We heard a couple of bursts at 569 but then not a lot .
I decided to experiment with a dual antenna system on the Saturday to see if there was any benefit to using the main 4x44's (quoted gain 24.1 dBd) along with a single 23el Tonna (quoted gain 13.8 dBd) for the contest on Sunday. The reason being is that I find the 4x44's excruciatingly sharp and from past results when I first started on 23cm with the Tonna, somewhat improved (longer) AR results, obviously because the wider beamwidth of the Tonna was less critical in comparison to the larger array.
As the caravan mast support base was still in my loft shack since the visit of Dave G0DJA when we did some 3cm tests, it was pressed into service to support a longer pole that put the single antenna at the same approximate height as the array. 7m of Ecoflex15 was used, about 3m less than what is on the array and 8 less connectors!
A high quality manual switch was utilised for quick comparisons.
I was pleased to note an approximate 2 S point difference of the array over the single yagi on beacons GM6BIG (33km) and GB3EDN (75Km). GB3CFG (161Km) was consistently better on the array except when an aircraft passed through the path when the increase in signal was much greater on the single yagi but this was not so apparent on GB3MHL (569Km) when I found reflections to be of a reasonably similar duration but the array a clear winner on signal strength.

In conclusion I decided against running with both antennas during the contest but it was interesting to go back to seeing how a single yagi station performed again. Obviously there will be occasions when a single 23el does produce longer aircraft reflections but the extra gain of the array makes for potentially better readability on weaker signals as well as increasing the chance of more distant troposcatter contacts being made.

73 Ray GM4CXM


Re: June UKuG Low Band Contest - Review

JFELL@...
 

Hi Ray et Al,
Sorry we did not make it this time on 23cms - our club HQ is only 120ft asl and in a very urban location - much diff to our normal contest sites which do work with you , sometimes ...

We heard a couple of bursts at 569 but then not a lot .

Considering the dire WX locally( Thunder cells /lightning in early hours , heavy rain and hail int. during contest ) I was pleased we managed to work 15 stations on 23cms and 7 on 13cms .

Did not run 9cms because Paul M0EYT and I are building for the EME Activity weekend 20/21June and extra SSPA mods in progress.

Best 23cm DX was into JO30 -think DM5A which was easy ssb .

Eddie G0EHV on N Yorks Moors was good on 23cms and also on 13cms to his partner in crime .Delighted that was his first ever on 9cms....

Sorry low on details but having to go on memory as Jules G0NZO has the log files to do the scores.

We have kept the 8- 39 el yagis and 2m dish upt mast so we can give some points away in the next UKAC on the 16th Tuesday(?).

Will be running 23cms on VHF NFD from IO80 site near Cerne Abbas -hope we do not have to abort this year due to incoming Gale/2" of rainfall...first time in 25 years of VHF fieldays that that has occured.

Once again KST was scrolling like a mad thing with EU traffic and virtually nobody seemed interested in looking West - there should be plenty of reports of VERY good rainscatter on the higher bands -if it had been a week earlier during the first Cumulative session I may have bettered the 45 stations I once worked from home in the late 1990s on 10GHz - most by direct CQ on 10GHz - where are you all now...?

We were also hearing constant signals from GB3ANG on 144MHz and had a loop running at times on .175 - this did still result in contacts....

Best 73
John
G0API
FRARS , G4RFR Contest Group.I090AS


Re: June UKuG Low Band Contest - Review

SAM JEWELL
 

Folks,
From here the conditions were variable. Ray was an 'easy' contact, being completed in just a few 30 second timed overs. As the signal was there all the time I think it was plain troposcatter between us. Several attempts with Ralph, G4ALY, failed on what is normally a reliable path. Assuming no major equipment failures or negative changes, then conditions were poor in that direction. This seems to agree with Ralph's observations.
Around mid day to early afternoon paths of 500- 600km into DL were workable although with levels a little below normal.
My thanks to G3LQR and G3TCT/P for contacts on all bands 23, 13 and 9cm.
Overall.... Enjoyable. There is a definite 'buzz' to working stations on these bands.
Thanks to everyone I worked or nearly worked!
73 de Sam

On 8 Jun 2009, at 00:05, "Ray" <gm4cxm@...> wrote:


Poor 23cm conditions and activity levels were noted during this 11 hour contest and I certainly felt it was far too long in duration.
Conditions did gradually improve as the day progressed but by that time even less appeared to be active.
A sign of the "credit crunch" appears to be a reduced number of aircraft around though Sunday is normally quieter. This effected the success of aircraft scatter as a means of contact. Repeated attempts to work G4RFR/P in IO90 for a new square failed miserably.

Two "initials" worked were G3TCT/P and a new local, Gordon GM3UCI.
Gordon is located in one of the best locations in Central Scotland and once fully operational he should present an easy contact for those requiring IO85 square. Gordon worked frantically this week to get most of his new transverter kit working and despite having no antenna relay installed for changeover, a current power level of .5w and antenna just off the ground, he was a good signal.
Gordon is also putting together a 10GHz station. That'll please many!

GM0USI IO75UV 7
GM3UCI IO85BR 39
GM0UHC IO85FW 52
GM3SBC/P IO86JF 74
GM4LBV IO86RQ 141
GI6ATZ IO74AJ 199
G0DJA IO93IF 361
G8DKK IO91VX 518
G3TCT/P IO91GI 545
G4DDK JO02PA 572
G4EAT JO01HR 572

73 Ray GM4CXM




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June UKuG Low Band Contest - Review

Ray <gm4cxm@...>
 

Poor 23cm conditions and activity levels were noted during this 11 hour contest and I certainly felt it was far too long in duration.
Conditions did gradually improve as the day progressed but by that time even less appeared to be active.
A sign of the "credit crunch" appears to be a reduced number of aircraft around though Sunday is normally quieter. This effected the success of aircraft scatter as a means of contact. Repeated attempts to work G4RFR/P in IO90 for a new square failed miserably.

Two "initials" worked were G3TCT/P and a new local, Gordon GM3UCI.
Gordon is located in one of the best locations in Central Scotland and once fully operational he should present an easy contact for those requiring IO85 square. Gordon worked frantically this week to get most of his new transverter kit working and despite having no antenna relay installed for changeover, a current power level of .5w and antenna just off the ground, he was a good signal.
Gordon is also putting together a 10GHz station. That'll please many!

GM0USI IO75UV 7
GM3UCI IO85BR 39
GM0UHC IO85FW 52
GM3SBC/P IO86JF 74
GM4LBV IO86RQ 141
GI6ATZ IO74AJ 199
G0DJA IO93IF 361
G8DKK IO91VX 518
G3TCT/P IO91GI 545
G4DDK JO02PA 572
G4EAT JO01HR 572

73 Ray GM4CXM


Re: 10Ghz Demi question....

Geoff Blake <geoff@...>
 

On Sun, 7 Jun 2009, Tony Gallagher wrote:

Sorry, I should have mentioned, we tried two different FT290s, MK1 and a
MK2 and also with two brand new transverters!!!! Makes things even more
confusing! :)
To the best of my knowledge, the FT290RII does not have the +ve feed on TX
as standard - mine didn't. Sam G4DDK has the mod to add the +ve feed on
his web site.

That aside, it seems that the series resistor is to high, if it is
dropping the voltage to 1.2V. I used 8K2 to switch a DB6NT transverter
successfully.

Geoff


--
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Re: 10Ghz Demi question....

Andy Talbot <andy.g4jnt@...>
 

Output resistance of the FT290 DC feed (what's the betting someone arbitrarily decided on a 10k R because its a nice value)   vs.  input resistance of the Demi ....................?

Andy  G4JNT
wobbleU cubed .g4jnt.kom


2009/6/7 Tony Gallagher <tony_g_ireland@...>



Sorry, I should have mentioned, we tried two different FT290s, MK1 and a MK2 and also with two brand new transverters!!!! Makes things even more confusing! :)

Tony

--- In ukmicrowaves@..., "Tony Gallagher" wrote:
>
> This weekend we were setting up the other two 10Ghz kits and getting them ready for air.
> However we encountered a very odd problem.
> The units are Demi 10Ghz units to be used with FT290s using the DC voltage from the rig over the IF to key it.
> The transverter will work and TX correctly when used with my FT817 which is modded to send 5VDC over the IF on TX, but it wont work with the FT290s!!!
> The 5VDC on the IF is present from the FT290 radio when the radio transmits but when its connected to the Demi, the IF voltage drops from 5VDC to 1.2Volts, I assume this drop is causing the Demi to not switch to TX mode. Why is this happening?
>
> Thanks in advance everyone.
>
> Tony
> EI4GHB
>



Re: 10Ghz Demi question....

Tony Gallagher <tony_g_ireland@...>
 

Sorry, I should have mentioned, we tried two different FT290s, MK1 and a MK2 and also with two brand new transverters!!!! Makes things even more confusing! :)


Tony

--- In ukmicrowaves@..., "Tony Gallagher" <tony_g_ireland@...> wrote:

This weekend we were setting up the other two 10Ghz kits and getting them ready for air.
However we encountered a very odd problem.
The units are Demi 10Ghz units to be used with FT290s using the DC voltage from the rig over the IF to key it.
The transverter will work and TX correctly when used with my FT817 which is modded to send 5VDC over the IF on TX, but it wont work with the FT290s!!!
The 5VDC on the IF is present from the FT290 radio when the radio transmits but when its connected to the Demi, the IF voltage drops from 5VDC to 1.2Volts, I assume this drop is causing the Demi to not switch to TX mode. Why is this happening?

Thanks in advance everyone.

Tony
EI4GHB


10Ghz Demi question....

Tony Gallagher <tony_g_ireland@...>
 

This weekend we were setting up the other two 10Ghz kits and getting them ready for air.
However we encountered a very odd problem.
The units are Demi 10Ghz units to be used with FT290s using the DC voltage from the rig over the IF to key it.
The transverter will work and TX correctly when used with my FT817 which is modded to send 5VDC over the IF on TX, but it wont work with the FT290s!!!
The 5VDC on the IF is present from the FT290 radio when the radio transmits but when its connected to the Demi, the IF voltage drops from 5VDC to 1.2Volts, I assume this drop is causing the Demi to not switch to TX mode. Why is this happening?

Thanks in advance everyone.

Tony
EI4GHB


Re: uKUG Spammed!

Ralph
 

Hello Andy,
Might as well look at these emails hi contest is dead in SW.
 
BT puts randomly,  live traffic into their spam folder from
Ukmicrowave/Flexradio and occassionally live ones to me.
So I still have to do a routine check every day to see there is
nothing needed there. I must admit though the spam has gone
down dramatically since Christmas.
73
Ralph
G4ALY

----- Original Message -----
Sent: Sunday, June 07, 2009 12:28 PM
Subject: [ukmicrowaves] uKUG Spammed!

My other BTInternet email account now gets very few spam messages so, this morning, I checked the only two in there only to find one was the subscription reminder for Scatterpoint (the other really was spam)
 
Presumably the words "subscription" and / or "renewal" triggered the filter, which has now had its training updated.

Andy  G4JNT
wobbleU cubed .g4jnt.kom